6800 not syncing!! Please Help!

[jpc0480]

Don't know what's gone wrong... I was able to sync the other day, and now I have hooked up my phone to my laptop and the light comes on that it's charging, but nothing else is happening. I deleted the sync partnership in the phone to see if it was a bad file and now I have lost my contacts. Can't seem to figure out what I've done wrong. Nothing has changed with my laptop and 6800 since the other day... Does anyone know what I can do to fix this? I am using Windows Mobile Device Center to sync with Windows Vista. Have had the phone for a couple months and everything til now has worked fine. I tried searching and came up with nothing... If there is a link out there could you please point me to the right direction.